You tried to run the 16-bit DOS .exe directly on 64-bit Windows 10, which lacks NTVDM (NT Virtual DOS Machine). Solution: Use DOSBox or OpenSupaplex – never run SUPAPLEX.EXE natively.
: Unzip the folder to your preferred directory. supaplex download windows 10
Open DOSBox’s configuration file ( dosbox-0.74.conf ). Find the [sound] section and change: You tried to run the 16-bit DOS